Method Of Recording Data On A Multi-layer Recording Medium, Recording Medium, And Apparatus Thereof - Patent 7596064

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Method Of Recording Data On A Multi-layer Recording Medium, Recording Medium, And Apparatus Thereof - Patent 7596064 Powered By Docstoc
					


United States Patent: 7596064


































 
( 1 of 1 )



	United States Patent 
	7,596,064



 Kim
,   et al.

 
September 29, 2009




Method of recording data on a multi-layer recording medium, recording
     medium, and apparatus thereof



Abstract

A method for recording data on a recording medium having one or more
     recording layers. The method includes reading control information
     including a plurality of control information units for controlling
     recording/reproducing of data from the recording medium. The control
     information unit includes a recording speed, an identifier of the
     recording layer, and a write strategy information depending on the
     recording speed, where a sequence of the information units is ordered
     according to the recording speed. The method further provides for
     recording the data on the recording layer based on the read control
     information unit including the identifier of the corresponding recording
     layer on which the data is to be recorded.


 
Inventors: 
 Kim; Jin Yong (Seongnam-si, KR), Suh; Sang Woon (Seoul, KR) 
 Assignee:


LG Electronics Inc.
 (Seoul, 
KR)





Appl. No.:
                    
11/723,805
  
Filed:
                      
  March 22, 2007

 Related U.S. Patent Documents   
 

Application NumberFiling DatePatent NumberIssue Date
 10880663Jul., 2004
 

 
Foreign Application Priority Data   
 

Jul 09, 2003
[KR]
10-2003-0046420

Sep 09, 2003
[KR]
10-2003-0063271

Sep 15, 2003
[KR]
10-2003-0063591

Sep 22, 2003
[KR]
10-2003-0065628



 



  
Current U.S. Class:
  369/47.28  ; 369/275.3; 369/47.5; 369/59.25
  
Current International Class: 
  G11B 7/00&nbsp(20060101)
  
Field of Search: 
  
  










 369/47.36,59.25,47.27,47.38,189,275.3,47.28,47.31,53.31,47.5,47.51
  

References Cited  [Referenced By]
U.S. Patent Documents
 
 
 
5361173
November 1994
Ishii et al.

5485469
January 1996
Suzuki

5502702
March 1996
Nakajo

5590096
December 1996
Ohtsuka et al.

5636631
June 1997
Waitz et al.

5764621
June 1998
Choi

5793546
August 1998
Tanaka

5835462
November 1998
Mimnagh

5892633
April 1999
Ayres et al.

5914920
June 1999
Yokogawa

5959962
September 1999
Matsumaru et al.

6335070
January 2002
Tomita

6415435
July 2002
McIntyre

6480450
November 2002
Fujii et al.

6487713
November 2002
Cohen et al.

6504806
January 2003
Nakajo

6535470
March 2003
Wu

6580671
June 2003
Otomo et al.

6643233
November 2003
Yen et al.

6684328
January 2004
Matsuura

6711107
March 2004
Chao et al.

6868054
March 2005
Ko

6891786
May 2005
Sato

6894961
May 2005
Osakabe

6996047
February 2006
Nagano

6999393
February 2006
Yamada

7012878
March 2006
Shinotsuka et al.

7075871
July 2006
Kato et al.

7088667
August 2006
Kobayashi

7161881
January 2007
Pereira

7170841
January 2007
Shoji et al.

7193948
March 2007
Furukawa et al.

7212480
May 2007
Shoji et al.

7218585
May 2007
Tanii et al.

7230907
June 2007
Shoji et al.

7286455
October 2007
Shoji et al.

7304938
December 2007
Hwang et al.

7345970
March 2008
Kim et al.

7369475
May 2008
Nagai

7376072
May 2008
Shoji et al.

7400571
July 2008
Shoji et al.

7414936
August 2008
Tasaka et al.

7423951
September 2008
Shoji et al.

7471879
December 2008
Fuchigami et al.

2001/0044935
November 2001
Kitayama

2001/0053114
December 2001
Miyake et al.

2001/0053115
December 2001
Nobukuni et al.

2002/0021656
February 2002
Tsukagoshi et al.

2002/0044509
April 2002
Nakajima

2002/0048241
April 2002
Kumagai et al.

2002/0048646
April 2002
Tomura et al.

2002/0085470
July 2002
Yokoi

2002/0089914
July 2002
Nakajo

2002/0114234
August 2002
Chao et al.

2002/0126604
September 2002
Powelson et al.

2002/0126611
September 2002
Chang

2002/0159352
October 2002
Yamada

2002/0167880
November 2002
Ando et al.

2003/0021201
January 2003
Kobayashi

2003/0021202
January 2003
Usui et al.

2003/0039187
February 2003
Geutskens

2003/0048241
March 2003
Shin et al.

2003/0058771
March 2003
Furukawa et al.

2003/0072251
April 2003
Kondo

2003/0076775
April 2003
Sato et al.

2003/0086345
May 2003
Ueki

2003/0086346
May 2003
Fukumoto

2003/0137915
July 2003
Shoji et al.

2003/0151994
August 2003
Tasaka et al.

2003/0159135
August 2003
Hiller et al.

2003/0223339
December 2003
Taniguchi et al.

2003/0231567
December 2003
Moritomo et al.

2003/0237024
December 2003
Ogawa et al.

2004/0001407
January 2004
Kim et al.

2004/0004921
January 2004
Lee et al.

2004/0010745
January 2004
Lee et al.

2004/0013074
January 2004
Lee et al.

2004/0022150
February 2004
Lee et al.

2004/0030962
February 2004
Swaine et al.

2004/0062160
April 2004
Park et al.

2004/0076096
April 2004
Hwang et al.

2004/0090888
May 2004
Park et al.

2004/0114474
June 2004
Park et al.

2004/0125717
July 2004
Ko et al.

2004/0145980
July 2004
Park et al.

2004/0184395
September 2004
Lee et al.

2004/0223434
November 2004
Nishimura et al.

2005/0019023
January 2005
Ko

2005/0030853
February 2005
Lee et al.

2005/0030870
February 2005
Rijpers et al.

2005/0036425
February 2005
Suh et al.

2005/0038957
February 2005
Suh

2006/0233059
October 2006
Suh et al.

2007/0088954
April 2007
Furukawa et al.

2008/0043588
February 2008
Suh et al.



 Foreign Patent Documents
 
 
 
1151071
Jun., 1997
CN

1400588
Mar., 2003
CN

1656544
Aug., 2005
CN

0 265 984
May., 1988
EP

0 552 903
Jul., 1993
EP

0 968 769
Jan., 2000
EP

968769
Jan., 2000
EP

1128383
Aug., 2001
EP

1 172 810
Jan., 2002
EP

1 244 097
Jun., 2002
EP

1298659
Apr., 2003
EP

1 308 942
May., 2003
EP

1 329 888
Jul., 2003
EP

1 331 631
Jul., 2003
EP

1 361 571
Nov., 2003
EP

1 369 850
Dec., 2003
EP

1 471 506
Oct., 2004
EP

1 522 994
Apr., 2005
EP

1 605 445
Dec., 2005
EP

06-309802
Nov., 1994
JP

09-128899
May., 1997
JP

09-134525
May., 1997
JP

09-160761
Jun., 1997
JP

11-085413
Mar., 1999
JP

2000-113458
Apr., 2000
JP

2002-050053
Feb., 2002
JP

2002 124038
Apr., 2002
JP

2002-230764
Aug., 2002
JP

2002-245625
Aug., 2002
JP

2002-352430
Dec., 2002
JP

2002-352435
Dec., 2002
JP

2003-006860
Jan., 2003
JP

2003-045036
Feb., 2003
JP

2003-203341
Jul., 2003
JP

2003-257026
Sep., 2003
JP

2006 507760
Mar., 2006
JP

WO 97/13244
Apr., 1997
WO

WO 00/79525
Dec., 2000
WO

WO 02/17308
Feb., 2002
WO

WO 02/29791
Apr., 2002
WO

WO 02/065462
Aug., 2002
WO

WO 02/086887
Oct., 2002
WO

WO 02/086888
Oct., 2002
WO

WO 02/089123
Nov., 2002
WO

WO 03/010519
Feb., 2003
WO

WO 03/025935
Mar., 2003
WO

WO 03/067581
Aug., 2003
WO

WO 03/075265
Sep., 2003
WO

WO 03/105139
Dec., 2003
WO

WO 2004/013845
Feb., 2004
WO

WO 2004/015707
Feb., 2004
WO

WO 2004/072966
Aug., 2004
WO

WO 2005/001819
Jan., 2005
WO



   
 Other References 

International Search Report issued Sep. 16, 2004 in corresponding International patent Application No. PCT/KR2004/001624. cited by other
.
Communication issued by European Patent Office on May 30, 2007 in counterpart EP App. No. 04 748 381.3. cited by other
.
Communication issued by European Patent Office on Jun. 1, 2007 in counterpart EP App. No. 07104646.0. cited by other
.
Communication issued by European Patent Office on Jun. 1, 2007 in counterpart EP App. No. 07104648.6. cited by other
.
Japanese Office Action issued in corresponding application dated Oct. 5, 2007. cited by other
.
Indian Office Action issued in corresponding application dated Jan. 29, 2008. cited by other
.
Office Action for corresponding Russian application dated Jun. 23, 2008. cited by other
.
Search Report for European Application No. 07120273.3 dated Jul. 2, 2008. cited by other
.
Office Action for corresponding Chinese Application No. 200710127832 dated Dec. 5, 2008. cited by other
.
Notice of Allowance issued by Russian Patent Office Apr. 16, 2009 for counterpart Russian application. cited by other
.
Article: Standard ECMA-279--Standardizing Information and Communication Systems--80 mm (1,23 Gbytes per side) and 120 mm (3,95 Gbytes per side) DVD-Recordable Disk (DVD-R), Dec. 1998. cited by other
.
Office Action for corresponding Japanese Application No. 2006-187883 dated Dec. 17, 2008. cited by other
.
Office Action for corresponding Japanese Application No. 2006-180280 dated Jan. 6, 2009. cited by other
.
European Search Report dated Mar. 4, 2009. cited by other
.
European Search Report dated Mar. 11, 2009. cited by other
.
European Search Report dated Mar. 27, 2009. cited by other
.
International Search Report dated Dec. 12, 2005. cited by other
.
Office Action for corresponding Japanese Application No. 2006-523136 dated Mar. 17, 2009. cited by other
.
Notice of Allowance issued by Russian Patent Office dated May 14, 2009 for counterpart Russian application. cited by other.  
  Primary Examiner: Tran; Thang V


  Assistant Examiner: Alunkal; Thomas D


  Attorney, Agent or Firm: Harness, Dickey & Pierce, P.L.C.



Parent Case Text



DOMESTIC PRIORITY INFORMATION


This is a continuation application of application Ser. No. 10/880,663
     filed Jul. 1, 2004, the entire contents of which are hereby incorporated
     by reference.

Claims  

What is claimed is:

 1.  A method for recording data on a recording medium having one or more recording layers, the method comprising: accessing control information for controlling
recording/reproducing of data from the recording medium, the control information including a plurality of information units, each information unit including a first identifier identifying the recording layer to which the corresponding information unit
applies and a second identifier indentifying a recording speed applicable to the corresponding recording layer, wherein a sequence of at least one information units is ordered according to increasing recording speed among the information units, and for a
same recording speed, the sequence of the at least one information unit is ordered according to ascending recording layer number among the information units;  and recording data on the recording medium based on the control information.


 2.  The method of claim 1, wherein the accessing step further accesses write strategy information included in each information unit, the write strategy information including write strategy parameters, the write strategy parameters corresponding
to recording power and pulse timing usable at the recording speed applicable to the recording layer during recording data.


 3.  The method of claim 2, wherein the accessing step further accesses a write strategy identifier included in each information unit, the write strategy identifier indicating a write strategy type, the write strategy type is one of n-1 write and
n/2 write strategy.


 4.  The method of claim 1, wherein the accessing step accesses the control information from a sub-area of a lead-in area of the recording medium.


 5.  The method of claim 1, wherein each information unit further includes sequence number information indicating a sequence of the information unit among the information units included in the control information.


 6.  A method for recording data on a recording medium having one or more recording layers, the method comprising: storing control information, the control information including a plurality of information units, each information unit including a
first identifier identifying the recording layer of the recording medium to which the corresponding information unit applies and a second identifier identifying a recording speed applicable to the corresponding recording layer, wherein a sequence of at
least one information units is ordered according to increasing recording speed among the information units, and for a same recording speed, the sequence of the at least one information unit is ordered according to ascending recording layer number among
the information units;  and recording data on the recording medium based on the stored control information.


 7.  The method of claim 6, wherein each information unit further includes write strategy information, the write strategy information including write strategy parameters, the write strategy parameters corresponding to recording power and pulse
timing usable at the recording speed applicable to the recording layer during recording of data.


 8.  The method of claim 7, wherein each information unit further includes a write strategy identifier, the write strategy identifier indicating a write strategy type, and the write strategy type is one of n-1 write strategy and n/2 write
strategy.


 9.  The method of claim 6, wherein each information unit further includes sequence number information indicating a sequence of the information unit among the information units included in the control information.


 10.  A computer-readable medium, comprising: a specific area of the computer-readable medium storing control information for controlling recording of data, the control information including a plurality of information units, each information unit
including a first identifier identifying the recording layer to which the corresponding information unit applies and a second identifier identifying a recording speed applicable to the corresponding recording layer, wherein a sequence of at least one
information units is ordered according to increasing recording speed among the information units, and for a same recording speed, the sequence of the at least one information unit is ordered according to ascending recording layer number among the
information units.


 11.  The computer-readable medium of claim 10, wherein each information unit further includes write strategy information, the write strategy information including write strategy parameters, the write strategy parameters corresponding to
recording power and pulse timing usable at the recording speed applicable to the recording layer during recording of data.


 12.  The computer-readable medium of claim 11, wherein each information unit includes a write strategy identifier, the write strategy identifier indicating a write strategy type, and the write strategy type is one of n-1 write strategy and n/2
write strategy.


 13.  The computer-readable medium of claim 10, wherein each information unit further includes a write strategy type identifier indicating write strategy type and the write strategy type is one of n-1 write strategy and n/2 write strategy.


 14.  The computer-readable medium of claim 10, wherein the specific area is a pre-recorded area of the computer-readable medium.


 15.  The computer-readable medium of claim 14, wherein the pre-recorded area is a sub-area of a lead-in area or lead-out area.


 16.  The computer-readable medium of claim 15, wherein the sub-area of the lead-in or lead-out area is a permanent information and control data (PIC) zone of the lead-in area or the lead-out area disclosed in Blu-ray disc.


 17.  The computer-readable medium of claim 10, wherein each information unit further includes sequence number information indicating a sequence of the information unit among the information units included in the control information.


 18.  A computer-readable medium, comprising: at least one recording layer provided with a recordable area and a control area, the control area storing information units, each information unit including a first identifier identifying the
recording layer to which the corresponding information unit applies and a second identifier identifying a recording speed applicable to the corresponding recording layer, wherein a sequence of at least one information units is ordered according to
increasing recording speed among the information units, and for a same recording speed, the sequence of the at least one information unit is ordered according to ascending recording layer number among the information units.


 19.  The computer-readable medium of claim 18, wherein the computer-readable medium is a recordable Blu-ray disc.


 20.  The computer-readable medium of claim 18, wherein at least one information unit is provided for the same recording speed and wherein, if a plurality of information units are provided for the same recording speed, the information unit for a
preferred write strategy is followed by the information unit for an alternative write strategy.


 21.  The computer-readable medium of claim 20, wherein each information unit includes write parameters for the write strategy.


 22.  The computer-readable medium of claim 18, wherein each information unit further includes sequence number information indicating a sequence of the information unit among the information units included in the control information.


 23.  The computer-readable medium of claim 18, wherein each information unit includes a write strategy identifier, the write strategy identifier indicating a write strategy type, and the write strategy type is one of n-1 write strategy and n/2
write strategy.


 24.  An apparatus for recording or reproducing data on or from a recording medium, comprising: an optical pickup configured to record or read data on or from the recording medium, and a controller configured to identify a recording speed for a
recording layer of the recording medium based on control information, the control information including a plurality of information units, each information unit including a first identifier identifying the recording layer to which the corresponding
information unit applies and a second identifier identifying a recording speed applicable to the corresponding recording layer, wherein a sequence of at least one information units is ordered according to increasing recording speed among the information
units, and for a same recording speed, the sequence of the at least one information unit is ordered according to ascending recording layer number among the information units, and the controller configured to control a recording of data on the recording
medium based on at least one information unit.


 25.  The apparatus of claim 24, further comprising: an interface configured to interface the controller with an external device.


 26.  The apparatus of claim 24, wherein each information unit includes write strategy information, the write strategy information including write strategy parameters, the write strategy parameters corresponding to recording power and pulse
timing usable at the recording speed applicable to the recording layer during recording of data;  and the controller is configured to control the optical pickup based on the write strategy parameters of at least one information unit during recording of
the data.


 27.  The apparatus of claim 26, wherein each information unit includes a write strategy identifier, the write strategy identifier indicating a write strategy type, and the write strategy type is one of n-1 write strategy and n/2 write strategy; 
and the controller is configured to control the optical pickup based on the write strategy type of at least one information unit during recording of the data.


 28.  The apparatus of claim 24, wherein the controller is configured to control the optical pickup to access the control information from a sub-area of a lead-in area of the recording medium.


 29.  The apparatus of claim 24, wherein each information unit further includes sequence number information indicating a sequence of the information unit among the information units included in the control information.


 30.  An apparatus for recording or reproducing data on or from a recording medium, comprising: a memory configured to store a plurality of disc control information, each disc control information including a first identifier identifying the
recording layer to which the corresponding disc control information applies and a second identifier identifying a recording speed applicable to the corresponding recording layer, wherein a sequence of at least one disc control information is ordered
according to the increasing recording speed among the information units, and for a same recording speed, the sequence of the at least one information unit is ordered according to ascending recording layer number among the information units;  an optical
pickup configured to read or write data from or on the recording medium;  and a controller, operatively coupled to the memory and the optical pickup, configured to control the optical pickup to record data on the recording medium based on at least one of
the disc control information.


 31.  The apparatus of claim 30, further comprising: an interface configured to interface the controller with an external device.


 32.  The apparatus of claim 30, wherein each information unit includes write strategy information, the write strategy information including write strategy parameters, the write strategy parameters corresponding to recording power and pulse
timing usable at the recording speed applicable to the recording layer during recording of data;  and the controller is configured to control the optical pickup based on the write strategy parameters of at least one information unit during recording of
the data.


 33.  The apparatus of claim 32, wherein each information unit includes a write strategy identifier, the write strategy identifier indicating a write strategy type, and the write strategy type is one of n-1 write strategy and n/2 write strategy; 
and the controller is configured to control the optical pickup based on the write strategy type of at least one information unit during recording of the data.


 34.  The apparatus of claim 30, wherein each information unit further includes sequence number information indicating a sequence of the information unit among the information units included in the control information. 
Description  

FOREIGN PRIORITY INFORMATION


This application claims the benefit of the Korean Application No. 10-2003-0046420 filed on Jul.  9, 2003, Korean Application No. 10-2003-0063271 filed on Sep. 9, 2003, Korean Application No. 10-2003-0063591 filed on Sep. 15, 2003, and Korean
Application No. 10-2003-0065628 filed on Sep. 22, 2003, which are hereby incorporated by reference.


BACKGROUND OF THE INVENTION


1.  Field of the Invention


The present invention relates to recording media, and more particularly, to a method of recording disc control information on a recordable optical disc including at least one recording layer, in which writing speed information and per writing
speed write strategy information (write strategy parameters) are included within the recorded disc control information, and to method of recording data using the disc control information recorded in a specific area of the recordable optical disc.


2.  Discussion of the Related Art


A high density optical recording medium, known as HD-DVD, is widely used to record and store high-definition video data, large-amount program data, and high-quality audio data and so on.  The Blu-ray disc represents next-generation HD-DVD
technology.  Technological specifications are now being established for the global standardization of the Blu-ray disc, including standards for the write once Blu-ray disc (BD-WO).  Meanwhile, a rewritable Blu-ray disc, known as the 1.times.-speed BD-RE
and now being discussed, should be compatible with BD-RE discs expected to have higher writing speeds, i.e., the 2.times.-speed BD-RE and beyond.  BD-WO specifications for high writing speed are also in progress.  Efficient solutions for coping with the
high writing speed of a high-density optical disc are Urgently needed, and the specifications established should ensure mutual compatibility.


SUMMARY OF THE INVENTION


One exemplary embodiment relates to a method for recording data on a recording medium having one or more recording layers.  The method provides for reading control information including a plurality of control information units for controlling
recording/reproducing of data from the recording medium.  The control information unit includes a recording speed, an identifier of the recording layer, and a write strategy information depending on the recording speed.  A sequence of the information
units is ordered according to the recording speed.  Thereafter, the method calls for recording the data on the recording layer based on the read control information unit including the identifier of the corresponding recording layer on which the data is
to be recorded.


Another exemplary embodiment relates to an apparatus for recording data on a recording medium having one or more recording layers.  The apparatus having a pick-up part for reading control information including a plurality of control information
units for controlling recording/reproducing of data from the recording medium.  The control information unit includes a recording speed, an identifier of the recording layer, and a write strategy information depending on the recording speed, where a
sequence of the information units is ordered according to the recording speed.  The apparatus also includes a controller for controlling recording the data on the recording layer based on the read control information unit including the identifier of the
corresponding recording layer on which the data is to be recorded.


Another exemplary embodiment relates to a recording medium having one or more recording layers.  A data area is configured to record user data on each recording layer.  One or more management areas are configured to record at least one control
information block including a plurality of control information unit for controlling recording/reproducing of a user data.  The control information unit includes a recording speed, an identifier of the recording layer, and a write strategy information
depending on the recording speed, where a sequence of the information units is ordered according to the recording speed.  A data area is configured to record the user data based on the read control information unit including the identifier of the
corresponding recording layer on which the data is to be recorded.


Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be
learned from practice of the invention.  The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.


It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.


BRIEF DESCRIPTION OF THE DRAWINGS


The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve
to explain the principle of the invention.  In the drawings:


FIG. 1 is a diagram of a single-layer disc applicable to the present invention;


FIG. 2 is a diagram of a dual-layer disc applicable to the present invention;


FIG. 3 is a diagram of a management area where disc control information of the present invention is recorded, illustrating a disc information recording format;


FIG. 4 is a diagram of a sample data structure of disc control information recorded according to a first embodiment of the present invention;


FIGS. 5A and 5B are diagrams of a sample configuration sequence of the disc control information recorded according to the first embodiment of the present invention;


FIGS. 6A and 6B are exemplary diagrams of recording the disc control information according to the first embodiment of the present invention;


FIGS. 7A-7C are other exemplary diagrams of recording the disc information according to the first embodiment of the present invention;


FIG. 8 is a diagram of a sample data structure of disc control information recorded according to a second embodiment of the present invention;


FIGS. 9A and 9B are exemplary diagrams of a configuration sequence of the disc control information recorded according to the second embodiment of present invention; and


FIG. 10 is a block diagram of an optical disc recording and reproducing apparatus according to the present invention.


DETAILED DESCRIPTION OF THE INVENTION


Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.  Wherever possible, the same reference numbers will be used throughout the drawings to
refer to the same or like parts.  For convenience of explanation, a Blu-ray disc (BD) is taken as an example of an optical disc according to the present invention.  Yet, it is apparent that the concept of the present invention, which is characterized in
an optical disc having its disc control information recorded thereon, is applicable to DVD-RAM/-RW/+RW/-R/+R and the like for example in the same manner.


Besides, although terms used in the present invention are possibly selected from the currently well-known ones, some terms are arbitrarily chosen by the applicant in some cases so that their meanings are explained in detail in the following
description.  Hence, the present invention should be understood with the intended meanings of the corresponding terms chosen by the applicant instead of the simple names or meanings of the terms themselves.


First of all, `disc control information` in the description of the present invention means an area including various information for disc record playback or information for disc record playback.  And, the disc control information is commonly
designated information provided to a prerecorded area within a disc or to an embossed area for a disc user by a disc manufacturer.  Yet, the disc control information is provided not only to the prerecorded area but also to a recordable area.  The disc
information within the prerecorded or embossed area can be copied to the recordable area as well.  And, they are just exemplary.


For instance, the disc control information is called `disc information` in BD or `physical format information` in DVD-RAM/-RW/+RW/-R/+R.  Hence, it is apparent that the technical background of the present invention is identically applicable to
`physical format information` in DVD-RAM/-RW/+RW/-R/+R.  For convenience of explanation, `disc information (hereinafter abbreviated DI)` corresponding to a case of Blu-ray disc (BD) is taken as an example.


FIG. 1 and FIG. 2 are structural diagrams of optical discs according to the present invention, in which a recordable optical disc is enough to be the optical disc applicable to the present invention.  Moreover, the recordable disc can be any one
of a rewritable optical disc, a write-once optical disc, and the like.


FIG. 1 is a structural diagram of a single-layer disc having one recording layer according to the present invention.


Referring to FIG. 1, a lead-in area is provided as a management area on an inner circumference area of an optical disc, whereas a lead-out area is provided as a management area on an outer circumference area of the optical disc.  Specifically, a
prerecorded area and a rewritable or write-once area are separated from each other within the inner circumference area of the disc.


The prerecorded area is an area (called `embossed area`) where data was already written in manufacturing the disc, whereby a user or system is unable to perform data writing on the prerecorded area at all.  In BD-RE/WO, the prerecorded area is
named PIC (permanent information and control data) area.  And, the above-described disc information (hereinafter called `DI`) as information required for disc recording is recorded in the PIC area.


In a data area, provided are a user data area where user's real data is recorded and spare areas ISA and OSA to replace a generated defect area.  Specifically, TDMA (temporary defect management area) for recording information of defect and
general managements is provided to such a write-once optical disc as BD-WO.  In case of the re-writable BD (BD-RE), TDMA is unnecessary so that such an area is left as a reserved area.


The present invention intends to provide a method of efficiently recording disc information (DI) as disc control information required for record playback of a disc in the prerecorded or recordable area.  It is apparent that a recording method in
the prerecorded area is differently applied to each kind of discs.  In case of BD-RE/WO, the PIC area as the prerecorded area is recorded by biphased high frequency modulated signals, the high frequency modulated signals in the corresponding area are
played back according to a specific playback method, and information is acquired from the playback.


FIG. 2 is a diagram of a dual-layer disc having dual recording layers, in which a recording layer starting with a lead-in is named a first recording layer Layer0 and a recording layer ending with a lead-out is named a second recording layer
Layer1.


In the dual-layer disc, the PIC area is provided to lead-in and lead-out areas of a disc inner circumference area, and disc information (DI) of the same contents is recorded in the PIC area.


FIG. 3 is a structural diagram of a PIC area in the disc shown in FIG. 1 or FIG. 2.  As mentioned in the foregoing description, it means that information can be rearranged like the structure of the PIC area in FIG. 3 when the entire information
within the high frequency modulated PIC area is acquired.


A method of configuring disc information (DI) in the PIC area is explained in detail as follows.


In BD-RE/WO, `one cluster` represents a minimum record unit, five hundred forty-four clusters gather to construct one fragment as one upper record unit, and total five fragments gather to form the PIC area.  Disc information is recorded in a
front head cluster of a first fragment IF0.  The disc information is plurally recorded per recording layer and writing speed permitted by the corresponding optical disc, and one disc information includes one hundred twelve bytes.  Specifically, disc
information constructed with 112-bytes is called disc information (DI) frame.  Moreover, the same contents of the disc information are repeatedly recorded in each front head cluster of the rest of the fragments, thereby enabling to cope with loss of the
disc information.


Information representing the corresponding recording layer, information representing writing speed, and write strategy information corresponding to the writing speed are recorded within each disc information.  Hence, such information is utilized
in record playback of the corresponding optical disc, thereby enabling to provide optimal recording power per recording layer and per writing speed.


Namely, the disc information (DI) of the present invention is characterized in providing specific writing speed information supported by the corresponding disc and associated write strategy information, and more specifically, in providing
specific writing speed supported for each recording layer and associated write strategy information via a specified method in case that a plurality of recording layers exist in the corresponding disc.


And, the specific configuration of the disc information (DI) relates to that of Blu-ray disc (BD).  It is also apparent that a DVD based disc may have a configuration different from the above-explained structure.  Specifically, if a size of disc
information (DI) corresponds to that of BD, it is 112 bytes equivalently for example.  Yet, by regarding disc information (DI) of the same recording layer as one information to provide once without repeating common information, it may be able to
configure the write strategy differing per writing speed only in addition.


Various embodiments for a method of configuring disc information and a method of recording specific information and the like within disc information according to the present invention are explained in detail by referring to the attached drawings
as follows.


FIGS. 4 to 7C are diagrams for a method of recording disc information of an optical disc according to a first embodiment of the present invention, in which disc information is configured per writing speed and in which disc information is
configured in a specific sequence per recording layer within each corresponding writing speed.


FIG. 4 shows a concept of recording disc control information of an optical disc according to a first embodiment of the present invention.


Referring to FIG. 4, a sequence for disc information each is decided by a sequence number and is recorded by 1-byte.  For instance, the information is recorded in a 5.sup.th byte within disc information, is named `DI frame sequence number in DI
block`, and is briefly represented by `00h, 01h, 02h, .  . . `. Namely, if the information of the 5.sup.th byte is `00h`, it means 1.sup.st disc information.  If the information of the 5.sup.th byte is `07h`, it means 8.sup.th disc information.


In configuring disc information, the present invention is characterized in that disc information is separately provided per writing speed and per recording layer and that a configuration sequence of a plurality of the separately provided disc
informations is uniformly decided according to a predetermined manner.


For instance, if a corresponding optical disc includes a pair of recoding layers and four kinds of applicable writing speeds (e.g., 1 speed, 2.times.  speed, 3.times.  speed, and 4.times.  speed) exist, disc information can be configured in a
following manner.


`00h` of 1.sup.st disc information is related to 1.times.  speed and 1.sup.st recording layer L0.  `01h` of 2.sup.nd disc information is related to 1.times.  speed and 2.sup.nd recording layer L1.  `02h` of 3.sup.rd disc information is related to
2.times.  speed and 1.sup.st recording layer L0.  `03h` of 4.sup.th disc information is related to 2.times.  speed and 2.sup.nd recording layer L1.  `04h` of 5.sup.th disc information is related to 3.times.  speed and 1.sup.st recording layer L0.  `05h`
of 6.sup.th disc information is related to 3.times.  speed and 2.sup.nd recording layer L1.  `06h` of 7.sup.th disc information is related to 5.times.  speed and 1.sup.st recording layer L0.  And, `07h` of 8.sup.th disc information is related to 5.times. speed and 2.sup.nd recording layer L1.


Namely, in configuring disc information, the present invention is characterized in that at least one disc information is configured per writing speed and the respective per writing speed disc informations are reconfigured per recording layer. 
Hence, the writing speed is preferred in the sequence of configuring the disc informations to a recording layer type.


FIG. 5A exemplarily shows a method of configuring disc information according the first embodiment of the present invention in FIG. 4, in which total sixteen disc informations are configured in case that four kinds of applicable writing speeds
(e.g., 1.times., 2.times., 433 , and 6.times.) and four recording layers (L0, L1, L2, and L3) exist within a disc.


Referring to FIG. 5A, 1.sup.st to 4.sup.th disc informations 00h to 03h become disc information for 1.times.  speed, 5.sup.th to 8.sup.th disc informations 04h to 07h become disc information for 2.times.  speed, 9.sup.th to 12.sup.th disc
informations 08h to 11h become disc information for 4.times.  speed, and 13.sup.th to 16.sup.th disc informations 02h to 15h become disc information for 6.times.  speed.


And, per writing speed disc informations come into configuring separate disc informations per recording layer to define as follows.  Namely, `00h`, `04h`, `08h`, and `12h` mean disc informations for 1.sup.st recording layer L0 at corresponding
writing speeds, respectively.  `01h`, `05h`, `09h`, and `13h` mean disc informations for 2.sup.nd recording layer L1 at corresponding writing speeds, respectively.  `02h`, `06h`, `10h`, and `14h` mean disc informations for 3.sup.rd recording layer L2 at
corresponding writing speeds, respectively.  And, `03h`, `07h`, `11h`, and `15h`mean disc informations for 4.sup.th recording layer L3 at corresponding writing speeds, respectively.


FIG. 5B exemplarily shows a method of configuring disc information according the first embodiment of the present invention in FIG. 4, in which total eight disc informations are configured in case that four kinds of applicable writing speeds
(e.g., 1.times., 2.times., 4.times., and 6.times.) and two recording layers (L0, L1) exist within a disc.


The disc information configuring method in FIG. 5B is as good as that in FIG. 5A.  First of al, per writing speed disc informations are preferentially configured and then reconfigured per recording layer.


FIG. 6A and FIG. 6B are exemplary diagrams of recording the disc control information according to the first embodiment of the present invention, in which intrinsic `recording layer information` and `writing speed information` are recorded within
disc information.


Referring to FIG. 6A, `DI frame sequence number in DI block` is provided to 5.sup.th byte of each disc information to mean a sequence, which means that disc informations are configured in a specific sequence in the same manner of FIG. 4. 
Besides, recording layer information and recording velocity information to be used for corresponding disc information are represented by specific bits to be provided to a specific area, e.g., 7.sup.th byte, within the corresponding disc information each. For instance, the recording layer information and the recording velocity information are recorded in upper and lower 4-bits of the 7.sup.th byte, respectively.


The recording layer information is defined as follows.  First of all, `0000b` of the recording layer information means 1.sup.st recording layer L0.  `0001b` of the recording layer information means 2.sup.nd recording layer L1.  And, `1111b` of
the recording layer information means 16.sup.th recording layer L15.


Meanwhile, the recording velocity information enables to define 4-bits in various ways as follows.  Namely, `0000b`, `0001b`, `0011b`, `0111b`, and `1111b` are defined to mean 1.times.  speed, 2.times.  speed, 4.times.  speed, 8.times.  speed,
and 16.times.  speed, respectively.


Hence, the above-manners of defining the recording layer information and the recording velocity information can be defined in various ways via specification establishment.  For example, the recording layer or velocity information can be defined
by allocating 1-byte thereto.


Thus, the intrinsic recording layer and velocity informations corresponding to its sequence number, as shown in FIG. 6A, are recorded in a previously promised specific location (7.sup.th byte), whereby it is facilitated to confirm the recording
layer and velocity informations of the corresponding disc information.  And, write power or write parameters fitting the recording layer and velocity are recorded in detail using P.sup.th.about.111.sup.th bytes, thereby enabling efficient record playback
using the informations.


FIG. 6B shows an example of disc information including its intrinsic recording layer information and recording velocity information, in which total sixteen disc informations are configured in case that four kinds of applicable writing speeds
(e.g., 1.times., 2.times., 4.times., and 6.times.) and four recording layers (L0, L1, L2, and L3) exist within a disc.


The detailed configuring method of the disc information is the same in FIG. 5A.  Considering the example in FIG. 6A, each of the disc informations includes its intrinsic recording layer information and recording velocity information.  For
instance, upper 4-bits of 7.sup.th byte within `02h` of 3.sup.rd disc information is set to `0010` to indicate 3.sup.rd recording layer L2 and lower 4-bits thereof is set to `0000` to indicate 1.times.  speed, whereby it can be apparently represented
that the corresponding disc information relates to 1.times.  speed and 3.sup.rd recording layer.


For another instance, upper 4-bits of 7.sup.th byte within `14h` of 15.sup.th disc information is set to `0010` to indicate 3.sup.rd recording layer L2 and lower 4-bits thereof is set to `0101` to indicate 1.times.  speed, whereby it can be
apparently represented that the corresponding disc information relates to 6.times.  speed and 3.sup.rd recording layer.


FIGS. 7A to 7C are diagrams of an another example of recording disc information according to the first embodiment of the present invention, in which `disc-applicable writing speed information` and `recording layer information existing within
disc` are commonly recorded within the corresponding disc.


Referring to FIG. 7A, `DI frame sequence number in DI block` is provided to 5.sup.th byte of each disc information to mean a sequence, which means that disc informations are configured in a specific sequence in the same manner of FIG. 4. 
Besides, writing speed information applicable by a corresponding disc is recorded within a specific area (N.sup.th byte) within disc, which is named `Writing speed flag` field.


For instance, whether a specific writing speed of eight kinds of writing speeds is applicable by the corresponding disc is represented by 1-bit each in the same area having 1-byte allocated thereto.  Namely, it can be defined that the
corresponding writing speed is not applicable (supported) if a bit value is `0b` in entire bits or that the corresponding writing speed is applicable (supported) if the bit value is `1b`.  Hence, each of the bits b0.about.b7 within 1-byte becomes flag
information indicating presence or non-presence of applicability of a specific writing speed.  For instance, if 1.times.  speed is applicable by a corresponding disc only, `0000 0001` is written in N.sup.th byte.  If all of the eight kinds of writing
speeds are applicable, `1111 1111` is written in the N.sup.th byte.


In the above explanation, 1.times.  and 2.times.  speeds utilized by every disc almost are previously decided to be adopted.  Yet, writing speeds decided by specification can be used as the rest writing speeds from 3.sup.rd writing speed.  For
instance, it is possible to set 3.sup.rd, 4.sup.th, 5.sup.th, 6.sup.th, 7.sup.th, and 8.sup.th writing speeds (3.sup.rd.times., 4.sup.th.times., 5.sup.th.times., 6.sup.th.times., 7.sup.th.times., 8.sup.th.times.) to 5.times., 6.times., 8.times.,
12.times., 14.times., and 16.times.  speeds, respectively.


Meanwhile, recording layer information indicating the number of recording layer(s) existing within the corresponding disc is recorded in another specific area (L.sup.th byte) within the disc information, which is named `Number of Recording Layer`
field.  For instance, a value meaning the number of the recording layer(s) can be represented by a binary number in the same area having 1-byte allocated thereto.  In case that the recording layer is the single layer in FIG. 1, `0000 0001` is written in
the L.sup.th byte.  In case that the recording layer is the dual layer in FIG. 2, `0000 0010` is written in the L.sup.th byte.  In case that four recording layers exist, `0000 0100` is written in the L.sup.th byte.


Since limitation is put on the number of the currently considered recording layer(s), which is currently two recording layers, 4-bits within the L.sup.th byte are enough to represent total fifteen recording layers (in case of `1111`).  In such a
case, it is apparent that other valid information can be written in the rest area (4-bits) of the L.sup.th byte.


Moreover, identification information for identifying a kind of write strategy (WS) recorded in P.sup.th.about.111.sup.th bytes is written in another specific area (M.sup.th byte) within the disc information, which is named `Write Strategy (WS)
Type` field.


Namely, in the disc information of the present invention, one write strategy (WS) is recorded for a specific writing speed and a specific recording layer and the write strategy is optionally selected from various kinds of specified types by a
disc manufacturer.  Hence, if the corresponding disc information is a first type write strategy WS-1, `0000 0001` is written in the M.sup.th byte.  If the corresponding disc information is a second type write strategy WS-2, `0000 0010` is written in the
M.sup.th byte.  And, substantial write strategy (WS) is recorded in P.sup.th.about.111.sup.th bytes.  Yet, the substantial write strategy (WS) will be recoded as a value interoperating with the decided write strategy (WS) type in the M.sup.th byte.  The
write strategy (WS) type via the M.sup.th byte is optionally recordable in every disc information.  And, it is also possible to apply one specified write strategy (WS) type in 1.times.  speed disc information, which is expected to be supported by every
record playback apparatus (FIG. 10), in a mandatory manner.


The detailed recording method of the write strategy (WS) is not a major concern of the present invention.  Yet, in brief, a medium property of a recording layer is generally modified by applying a laser beam to the recording layer within an
optical disc via a pickup (`11` in FIG. 10) to perform a recording thereof.  Hence, it should be decided a strength (write power) of the laser beam, a time of applying the write power thereto, and the like.  The above-decided various kinds of write
strategies are named `Write Strategy (WS)` in general and specific contents recorded within a specific `Write Strategy (WS)` are named `Write Strategy (WS) parameters`.


And, the write strategy (WS) can be recorded in various ways.  As a disc becomes to be highly densified and to run at higher speed, a writing speed, i.e., disc RPM) as well as the medium property of the recording layer is considerably affected. 
Hence, a more accurate system is requested.  And, the various write strategies (WS) are explained as follows for example.


First of all, there is a system having a recording pulse smaller by 1 than a recording mark size (n) formed on a recording layer medium, which may be called `(n-1) WS`.  Secondly, there is a system having a recording pulse having a size amounting
to a half of the recording mark size (n), which may be called `n/2 WS`.  Besides, new write strategies (WS) keep being developed.  Regarding the different kinds of write strategy (WS), when there exist the various systems of the write strategy (WS) exist
as parameters applied to the write strategies (WS) differ from each other, a disc manufacturer tests the recording power according to the write strategy (WS) recorded in the selected M.sup.th byte and then records a result of the test as write strategy
(WS) in the P.sup.th.about.111.sup.th bytes within the disc information.


From the above-recorded `writing speed information` in the N.sup.th byte and the `recording layer information` in the L.sup.th byte, the record playback apparatus (FIG. 10) recognizes how many disc informations exist within the corresponding
disc.  Namely, the number of the existing disc informations is found by multiplying an applicable writing speed number by the number of recording layers.


As the present invention applies one write strategy (WS) for a specific writing speed and a specific recording layer, the kind (type) and number of the write strategy (WS) may not be taken into consideration in deciding the number of disc
information(s).  Yet, in a second embodiment of the present invention, it will be described that a plurality of write strategies (WS) can exist for a specific writing speed and a specific recording layer.  In such a case, the total number of the existing
disc informations is not always found by multiplying an applicable writing speed number by the number of recording layers.


Hence, a sequence of a plurality of the above-decided disc informations is decided by the sequence numbers, which is written in the 5.sup.th byte in the foregoing description, and each of the disc informations designates the previously decided
writing speed and recording layer by the sequence.


For example, by knowing that four writing speeds applicable by a disc exist if the N.sup.th byte is `0000 1111` and that two recording layers exist within the disc if the L.sup.th byte is `0000 0010`, total eight disc informations are needed so
that the sequence will be `00h.about.07h`.  And, it is previously decided that disc informations of `00h`, `01h`, `02h`, `03h`, `04h`, `05h`, `06h`, and `07h` relate to `1.times.  speed, 1.sup.st recording layer`, `2.times.  speed, 2.sup.nd recording
layer`, `2.times.  speed, 1.sup.st recording layer`, `2.times.  speed, 2.sup.nd recording layer`, `3.sup.rd writing speed, 1.sup.st recording layer`, `3.sup.rd writing speed, 2.sup.nd recording layer`, `4.sup.th writing speed, 2.sup.nd recording layer`,
and `4.sup.th writing speed, 2.sup.nd recording layer`, respectively.


Hence, in order to acquire the disc information for a specific target writing speed and a specific target recording layer, the record playback apparatus (FIG. 10) is facilitated to check which disc information is related to the specific target
writing speed and recording layer from `writing speed information` of the N.sup.th byte and `recording layer information` of the L.sup.th byte commonly recorded within the respective disc informations instead of playing back to check the entire disc
informations.


FIG. 7B shows an example of recording disc information according to the first embodiment of the present invention in FIG. 7A.  It can be known that there are two (1.times., 2.times.) applicable writing speeds from N.sup.th byte (`0000 0010b`)
commonly recorded in the entire disc informations and that two recording layers exist within a disc from L.sup.th byte (`0000 0010b`).


Hence, in the example of FIG. 7B, total four disc informations (two recording layers*two writing speeds) exist and a sequence of the disc informations becomes `00h` (1.times.,L0).fwdarw.`01h` (1.times.,L1).fwdarw.`02h` (2.times.,L0).fwdarw.`03h`
(2.times.,L1).  This is done by a specified content according to a predetermined sequence.  Thus, the entire disc informations should be configured according to the above manner to enable reciprocal compatibility for utilization.


An intrinsic write strategy (WS) is recorded in other bytes within each disc information as well as N.sup.th and L.sup.th bytes.  Specifically, information of a type of a write strategy (WS) written in P.sup.th.about.111.sup.th bytes within the
corresponding disc information is recorded in M.sup.th byte.  Namely, informations in the M.sup.th and P.sup.th.about.111.sup.th bytes can differ in each disc information.


In the example in FIG. 7B, `00h` (1.times.,L0) and `01h` (1.times.,L1) relate to the application of a first type write strategy (WS-1) and `02h` (2.times.,L0) and `03h` (2.times.,L1) relate to the application of a second type write strategy
(WS-2).


FIG. 7C shows another example of recording disc information according to the first embodiment of the present invention in FIG. 7A.  It can be known that there are eight (1.times., 2.times., .  . . , 16.times.) applicable writing speeds from
N.sup.th byte (`1111 1111b`) commonly recorded in the entire disc informations and that four recording layers exist within a disc from L.sup.th byte (`0000 0100b`).


Hence, in the another example of FIG. 7C, total thirty-two disc informations (four recording layers*eight writing speeds) exist and a sequence of the disc informations becomes `00h` (1.times.,L0).fwdarw.`01h`(1.times.,L1).fwdarw.`02h`
(1.times.,L2).fwdarw.`03h` (1.times.,L4).fwdarw.`04h` (2.times.,L0).fwdarw.  . . . .fwdarw.`31h` (16.times.,L4).  This is done by a specified content according to a predetermined sequence.  Thus, the entire disc informations should be configured
according to the above manner to enable reciprocal compatibility for utilization.


An intrinsic write strategy (WS) is recorded in other bytes within each disc information as well as N.sup.th and L.sup.th bytes.  Specifically, information of a type of a write strategy (WS) written in P.sup.th.about.111.sup.th bytes within the
corresponding disc information is recorded in M.sup.th byte.  Namely, informations in the M.sup.th and P.sup.th111.sup.th bytes can differ in each disc information.


In the another example of FIG. 7C, if a record playback unit (FIG. 10) intends to search disc information related to 2.times.  speed (2.times.,L0) of a first recording layer to perform recording by applying a write strategy (WS) within the
corresponding disc information, it can be known from the informations in the N.sup.th and L.sup.th bytes commonly recorded in the entire disc informations that total thirty-two disc informations (four recording layers*eight writing speeds) exist in the
corresponding disc according to the sequence of the disc informations such as `00h` (1.times.,L0).fwdarw.`01h` (1.times.,L1).fwdarw.`02h` (1.times.,L2).fwdarw.`03h` (1.times.,L4) .fwdarw.`04h` (2.times.,L0).fwdarw.  . . . .fwdarw.`31h` (16.times.,L4). 
Hence, the record playback apparatus (FIG. 10) enables to recognize that the disc information related to the 2.times.  speed (2.times.,L0) of the first recording layer to be searched is `04h` and that the corresponding disc information (`04h`) is
recorded as the first type write strategy (WS-1) from the write strategy (WS) type identification information (`0000 0001b`) recorded in the M.sup.th byte within the corresponding information (`04h`), thereby reading out parameter values of the first
type write strategy (WS-1) via the P.sup.th.about.111.sup.th bytes to utilize in the recording.


Likewise, if intending to search disc information related to 16.times.  speed (16.times.,L3) of a fourth recording layer to perform recording by applying a write strategy (WS) within the corresponding disc information, the record playback unit
(FIG. 10) recognizes that the corresponding disc information is `31h` via the same process and that the write strategy type (WS) is the second type (WS-2), thereby enabling to utilize them in the recording.


FIGS. 8 to 9B shows a method of recording disc information of an optical disc according to a second embodiment of the present invention, which is extended from the first embodiment of the present invention in FIG. 4.  The second embodiment of the
present invention is characterized in that disc information is configured per writing speed, disc information is configured per recording layer within the corresponding writing speed, and at least one write strategy (WS) is configured for each disc
information per corresponding recording layer.


FIG. 8 shows a concept of the method of recording disc information of the optical disc according to the second embodiment of the present invention.


Referring to FIG. 8, a sequence for disc information each is decided by a sequence number and is recorded by 1-byte.


For instance, the information is recorded in a 5.sup.th byte within disc information, is named `DI frame sequence number in DI block`, and is briefly represented by `00h, 01h, 02h, .  . . `. Namely, if the information of the 5.sup.th byte is
`00h`, it means 1.sup.st disc information.  If the information of the 5.sup.th byte is `07h`, it means 8.sup.th disc information.


In configuring disc information, the present invention is characterized in that disc information is separately provided per writing speed and per recording layer and that a configuration sequence of a plurality of the separately provided disc
informations is uniformly decided according to a predetermined manner.


For instance, if a corresponding optical disc includes a pair of recoding layers and plural kinds of applicable writing speeds exist, disc information can be configured in a following manner.


`00h` of 1.sup.st disc information is related to 1.times.  speed, 1.sup.st recording layer L0, and WS1.  `01h` of 2.sup.nd disc information is related to 1.times.  speed, 1.sup.st recording layer L0, and WS2.  `02h` of 3.sup.rd disc information
is related to 1.times.  speed, 2.sup.nd recording layer L1, and WS1.  `03h` of 4.sup.th disc information is related to 1.times.  speed, 2.sup.nd recording layer L1, and WS2.  `04h` of 5.sup.th disc information is related to 2.times.  speed, 1.sup.st
recording layer L0, and WS1.  `05h` of 6.sup.th disc information is related to 2.times.  speed and 1.sup.st recording layer L0, and WS3.  `06h` of 7.sup.th disc information is related to 2.times.  speed, 2.sup.nd recording layer L1, and WS1.  And, `07h`
of 8.sup.th disc information is related to 2.times.  speed, 2.sup.nd recording layer L1, and WS3.


Namely, in configuring disc information, the second embodiment according to the s present invention is characterized in that at least one disc information is configured per writing speed, the respective per writing speed disc informations are
reconfigured per recording layer, and at least one WS type is provided to each recording layer.


Hence, the writing speed, the recording layer, and the WS type are taken into consideration in order of priority in configuring the disc informations.


FIG. 9A exemplarily shows a method of configuring disc information according the second embodiment of the present invention in FIG. 8, in which total sixteen disc informations are configured in case that four kinds of applicable writing speeds
(e.g., 1.times., 2.times., 4.times., and 6.times.) and four recording layers (L0, L1, L2, and L3) exist within a disc.


Referring to FIG. 9A, `DI frame sequence number in DI block` is provided to 5.sup.th byte of each disc information to mean a sequence, which means that disc informations are configured in a specific order (writing speed.fwdarw.recording
layer.fwdarw.WS type) of priority in FIG. 8.  Besides, writing speed information applicable by a corresponding disc is recorded within a specific area (N.sup.th byte) within disc, which is named `Writing speed flag` field.  For instance, whether a
specific writing speed of eight kinds of writing speeds is applicable by the corresponding disc is represented by 1-bit each in the same area having 1-byte allocated thereto.


Namely, it can be defined that the corresponding writing speed is not applicable (supported) if a bit value is `0b` in entire bits or that the corresponding writing speed is applicable (supported) if the bit value is `1b`.  Hence, each of the
bits b0.about.b7 within 1-byte becomes flag information indicating presence or non-presence of applicability of a specific writing speed.  For instance, if 1.times.  speed is applicable by a corresponding disc only, `0000 0001` is written in N.sup.th
byte.  If all of the eight kinds of writing speeds are applicable, `1111 1111` is written in the N.sup.th byte.  In the drawing, `0000 0111b` is written in the N.sup.th byte to allow 1.sup.st to 3.sup.rd writing speeds.


In the above explanation, 1.times.  and 2.times.  speeds utilized by every disc almost are previously decided to be adopted.  Yet, writing speeds decided by specification can be used as the rest writing speeds from 3.sup.rd writing speed.  For
instance, it is possible to set 3.sup.rd, 4.sup.th, 5.sup.th, 6.sup.th, 7.sup.th, and 8.sup.th writing speeds (3.sup.rd.times., 4.sup.th.times., 5.sup.th.times., 6.sup.th.times., 7.sup.th.times., 8.sup.th.times.) to 4.times., 6.times., 8.times.,
12.times., 14.times., and 16.times.  speeds, respectively.


And, information of informing a kind of write strategy (WS) applicable by a specification of a corresponding disc is recorded in another specific area (L.sup.th byte) within the disc information, which is named `Write Strategy (WS) flag` field. 
For instance, whether a specific write strategy (WS) of eight kinds of write strategies (WS) is applicable by the corresponding disc is represented by 1-bit each in the same area having 1-byte allocated thereto.  Namely, it can be defined that the
corresponding write strategy (WS) is not applicable (supported) if a bit value is `0b` in entire bits or that the corresponding write strategy (WS) is applicable (supported) if the bit value is `1b`.  Hence, each of the bits b0-b7 within 1-byte becomes
flag information indicating applicability of a specific write strategy (WS).  For instance, if 1.sup.st to 3.sup.rd type write strategies WS1 to WS3 are applicable by a corresponding disc only, `0000 0111b` is written in L.sup.th byte.  If all of the
eight types of write strategies (WS1 to WS8) are applicable, `1111 1111b` is written in the L.sup.th byte.  In the drawing, `0000 1111b` is written in the L.sup.th byte to indicate that four WS types WS1 to WS4 are applicable.


Moreover, recording layer information indicating the number of recording layer(s) existing within the corresponding disc is recorded in another specific area (M.sup.th byte) within the disc information, which is named `Number of Recording Layer`
field.  For instance, a value meaning the number of the recording layer(s) can be represented by a binary number in the same area having 1-byte allocated thereto.  In case that the recording layer is the single layer (one recoding layer) in FIG. 1, `0000
0001b` is written in the M.sup.th byte.  In case that the recording layer is the dual layer (two recording layers) in FIG. 2, `0000 0010b` is written in the M.sup.th byte.  In case that four recording layers exist, `0000 0100b` is written in the M.sup.th
byte.


Besides, parameters of a selected write strategy (WS) are written in another specific area (P.sup.th.about.111.sup.th bytes) within the disc information, which is named `Write Strategy (WS) parameters` field.


By writing the N.sup.th, L.sup.th, and M.sup.th byte informations recorded within the disc information by the same values in common to the entire disc informations, respectively, the record playback apparatus (FIG. 10) is facilitated to acquire
the informations of the writing speed applicable by the corresponding disc, the write strategy (WS) kind, and the number of the recording layers despite playing back any disc information.


Specifically, it may be able to record disc information per writing speed, per recording layer, and per write strategy (WS) type.  Yet, in such a case, the number of the recorded disc informations excessively increases.  Moreover, a disc
manufacturer should test the entire write strategy (WS) types and record the test results within the disc information, whereby it becomes a burden.


Therefore, in the embodiment according to the present invention, write strategies (WS) of which number (m) is smaller than that (n) of the maximum applicable write strategy types are recordable within disc information and a disc manufacturer
further enables to optionally record a specific one of a plurality of write strategies (WS), whereby disc manufacturer's convenience is secured as well as an efficient recording of disc information is enabled.


In FIG. 9A, recording is performed at 1.times.  speed (1.times.) using 1.sup.st and 2.sup.nd type write strategies WS1 and WS2, at 2.times.  speed (2.times.) using 2.sup.nd and 3.sup.rd type write strategies WS2 and WS3, or at 3.sup.rd writing
speed (3.times.) using 3.sup.rd and 4.sup.th type write strategies WS3 and WS4.


Namely, it is able to record disc information using write strategy (WS) types (two types) less than total applicable write strategy (WS) types (four types) per writing speed.


FIG. 9B shows another example of recording disc information according to the second embodiment of the present invention in FIG. 8.  Like FIG. 9A, three kinds of applicable writing speeds exist and `0000 0111b` is written in N.sup.th byte.  Four
applicable write strategy types exist and `0000 1111b` is written in L.sup.th byte.  And, two recording layers exist within a disc and `0000 0010b` is written in M.sup.th byte.


Specifically, in configuring disc information using one of a plurality of applicable write strategies (WS), at least one disc information is configured per the same writing speed and recording layer.  In doing so, the most preferentially provided
disc information is defined as preferred WS provided by a disc manufacturer and another disc information following the preferred WS is defined as alternative WS.


Namely, both disc information `00h` and disc information `01h` relate to 1.times.  speed (1.times.) and 1.sup.st recording layer (L0).  Yet, the WS1 type information recorded in `00h` as preferentially provided disc information becomes the
preferred WS and the WS1 type information recorded in `01h` as a next provided one becomes the alternative WS.


And, disc information `04h`, disc information `05h`, and disc information `06h`relate to 2.times.  speed (2.times.) and 1.sup.st recording layer (L0).  Yet, the WS2 type information recorded in `04h` as preferentially provided disc information
becomes the preferred WS, and the WS1 type information recorded in `05h` and the WS3 type information recorded in `06h` as next provided ones become the alternative WSs, respectively.  Namely, they can be applied to at least three disc informations of
the same writing speed/recording layer.


Moreover, disc information `10h` relates to 3.sup.rd speed (3.sup.rd .times.) and 1.sup.st recording layer (L0) and disc information `11h` relates to 3.sup.rd speed (3.sup.rd .times.) and 2.sup.nd recording layer (L0).  In case that only one WS
type information is provided to the same writing speed/recording layer, the provided WS becomes the preferred WS.


Namely, when a disc manufacturer provides disc information within a disc according to the previously determined specification, an optical record playback apparatus (FIG. 10) reads out the disc information in a specific order (writing
speed.fwdarw.recording layer).  If a plurality of disc informations exist on the same writing speed/recording layer, the optical record playback apparatus (FIG. 10) recognizes the preferentially provided WS within the disc information as the preferred WS
and the next WS as the alternative WS additionally provided by a disc manufacturer, thereby enabling record playback using disc information efficiently.


FIG. 10 is a block diagram of an optical disc record playback according to the present invention.


Referring to FIG. 10, a record playback apparatus according to the present invention includes a record playback unit 10 carrying out record playback on an optical disc and a control unit 20 controlling the record playback unit 10.


The control unit 20 gives a record or playback command for a specific area, and the record playback unit 10 caries out the record/playback for the specific area according to the command of the control unit 20.  Specifically, the record playback
unit 10 includes an interface unit 12 performing communications with an external device, a pickup unit 11 directly recording data on the optical disc or playing back the data, a data processor 13 receiving a playback signal from the pickup unit 11 to
restore into a necessary signal value or modulating to deliver a signal to be recorded into a signal to be recorded on the optical disc, a servo unit 14 reading out a signal from the optical disc correctly or controlling the pickup unit 11 to record a
signal on the optical disc correctly, a memory 15 temporarily storing disc control information including disc control information, and a microcomputer 16 responsible for controlling the above-described elements within the record playback unit 10.


A recording process of an optical disc according to the present invention is explained in detail as follows.


First of all, once an optical disc is loaded in the optical record playback apparatus, the entire disc management information within the disc is read out to be temporarily stored in the memory 15 of the record playback unit 10.  And, various
kinds of the disc management information are utilized for the record/playback of the optical disc.  Specifically, the management information stored in the memory 15 includes disc control information of the present invention.  Hence, the recording layer
information, writing speed information, and write strategy fitting the corresponding writing speed recorded within the disc information are read out to be stored in the memory.


If intending to perform a recording on a specific area within the optical disc, the control unit 20 renders such an intent into a writing command and then delivers it to the record playback unit 10 together with data for writing location
information to be recorded.  After receiving the writing command, the microcomputer 16 decides the corresponding writing speed applied to an intended recording layer within the optical disc from the management informations stored in the memory 15 and
then performs the writing command using the optimal write strategy by referring to the decided writing speed.


Specifically, in case that the recording is performed on the optical disc by the present invention, the disc information as management information is provided in a specific order and the microcomputer 16 recognizes which WS is the preferred WS of
the disc manufacturer in the same writing speed/recording layer.  Therefore, it is more facilitated to perform the recording on a specific recoding layer within an optical disc at a specific writing speed.


Accordingly, the present invention provides various methods of providing disc control information coping with higher writing speed in a high-density optical disc, thereby enabling to uniformly apply the standardized disc control information to
efficiently cope with the record/playback of the optical disc.


It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention.  Thus, it is intended that the present invention covers the modifications and variations of this invention provided
they come within the scope of the appended claims and their equivalents.


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DOCUMENT INFO
Description: FOREIGN PRIORITY INFORMATIONThis application claims the benefit of the Korean Application No. 10-2003-0046420 filed on Jul. 9, 2003, Korean Application No. 10-2003-0063271 filed on Sep. 9, 2003, Korean Application No. 10-2003-0063591 filed on Sep. 15, 2003, and KoreanApplication No. 10-2003-0065628 filed on Sep. 22, 2003, which are hereby incorporated by reference.BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to recording media, and more particularly, to a method of recording disc control information on a recordable optical disc including at least one recording layer, in which writing speed information and per writingspeed write strategy information (write strategy parameters) are included within the recorded disc control information, and to method of recording data using the disc control information recorded in a specific area of the recordable optical disc.2. Discussion of the Related ArtA high density optical recording medium, known as HD-DVD, is widely used to record and store high-definition video data, large-amount program data, and high-quality audio data and so on. The Blu-ray disc represents next-generation HD-DVDtechnology. Technological specifications are now being established for the global standardization of the Blu-ray disc, including standards for the write once Blu-ray disc (BD-WO). Meanwhile, a rewritable Blu-ray disc, known as the 1.times.-speed BD-REand now being discussed, should be compatible with BD-RE discs expected to have higher writing speeds, i.e., the 2.times.-speed BD-RE and beyond. BD-WO specifications for high writing speed are also in progress. Efficient solutions for coping with thehigh writing speed of a high-density optical disc are Urgently needed, and the specifications established should ensure mutual compatibility.SUMMARY OF THE INVENTIONOne exemplary embodiment relates to a method for recording data on a recording medium having one or more recording layers. The method provides for r